A while ago I posted about this tentacle in my aquarium, someone told me that it was a spaghetti worm, but now they are all over the place and I want to get rid of them, any help is welcome.
I made a video with them https://youtu.be/lqxUHjErP3Y
Man, look at all of them. That is a beautiful sight to me.
If you want rid of them, manual removal. Pretty much dig them out or siphon out during water changes.
With that said, they will only hit the numbers able to be supported by the nutrients in the water column. No food means low numbers.
All of that said, they still aren't harmful.